Yes, it makes your suitcase heavier. Yes, it takes up more space.
But all the travel e-books and mobile app guides in the world put together are still less handy than a sturdy little guidebook you can hold in your hand.
Among the various brands -- Frommer's, Fodor's, Lonely Planet, Moon, DK, Rick Steves and more -- there are likely enough volumes to pave China.
Many of them publish in e-book form, too, spinning travel advice through the digital realm.